Improvement in circular saw-mill



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Letters Patent No. 94,878, dated September 14, 1869.

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IMPROVEMENT IN CIRCUIIAR SAW-MILL.

The Schedule referred to in these Il'.|etter Patent and making part of the same. i

To all whom it 'may concern Be it known that I, DAVID EVANS, 'of Eureka, in' the coun ty of Humboldt, and State of California, have invented certain new and useful Improvements in Circular Saw-Mills; aud I do hereby declare that the fobI lowing is a full and exact' description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon. v

Thenature ofmy invention islto provide an improved circular saw-mill, 'so constructed that a log of great diameter can be sawed without the necessity of tirst dividingitnvhich is the usual waywheu operating with the ordinary gang or circular saw-mills.

Myinvention consists in so arranging a gang of saws on the frame, and providing a small horizontal saw,

which follows or precedes the gang, and rabbets out` a piece that the end of the arbor or collar of the centre saw of the gang may pass.

arranged on the frame in the usual-way, with the upper saw extended beyond the vertical plane of the lower saws. v

Near the end of the cross-beam B of the frame, I

attach a vertical spindle, the end of which is provided with a small horizontal-saw, C, which precedes or follows the gang on a 'plane with the cutting-edge of the saw A, 'and thel collar 'or arbor I), of the saw A1,.and

. when in operation, rahbets onta longitudinal piece along the edge or joint E, and the upper-saw A2 cuts' a' saws of the gang cut. their width.

The relative position of the gang of three is such,

that the upper face of the log is just as much in ad; Vance of the lower face of it, as the upper saw is ofthe lower saw, and the'dstance between the vertical plane ot' the 4upper and lower sawsare equal to the thickness of the upper saw A2, added to the thickness of thelower saw A, divided by two (2) and added to-the thickness of board or out, projection of arbor or collar of saw A1, and clearance. The clearance may be greater without aiecting the operation and perfect working of the gang. Y

4lt will here'be observed Vthat when the greatest depth is obtained, the lower cut or `board will be the greater, and the upper one the lesser in width. Y In operatingwith my saw-mill at first, the lower saws of the gang slab one side' ofthe log, and the upper saw is not engaged, but as the set advances, the upper saw c uts but little depth, and the, horizontal saw following `or preceding cuts longitndiuall and a small angular piece of the log is taken off .wi 1h wane top.

Having thus described my invention, I would here state that I do not claim the horizontal saw for cutting the timber into studding or dimension stu", as it is called, but

That I do claim, and desire to secure by Letters Patent, is A 'lhe saws A, A1, A2, and C, when arranged to opcrate substantially as and for the purpose described.

In witness whereof, I have hereunto set my hand and seal.

Witnesses:

J As. M. Snoer, ED. H. VANon.

DAVID EVANS. IL. sj 

